Ghostwrite My Sons Story into a small book

My sons story of Battling Terminal Cancer can be found all over the internet & social medias. Most of the story is already written or video-graphed by various Media Companies, all found on google & other search engines. I also created a blog many moons ago with my personal view - up to a certain year. I can fill in all the blanks and answer any questions.
Id like the book to be 36-50 pages & readable by most ages!